
It's not the norm in the UK, but they do have their uses.
A friend of mine had never used a crate for any of her puppies, but thought she would give it a go with her new red boy, but didn't really know how to start.
I advised her to make it into a den, cover with a blanket or similar on three sides & the top, leave the door open & feed her puppy in there, pop him in every time he fell asleep, put a chewy toy & piece of bedding from the breeder & something of hers. This she did & after two days he started to take himself off to sleep in the crate, went overnight without needing to pee or poo & as soon as she got his food dish out he went into the crate. I did advise her to set the alarm during the night so she could let him out for a pee etc & then put him back to bed. She was very impressed as this means she can safely leave him & her other Irish Setter, Jamie, if she has to go out & leave them alone knowing that the puppy will not have got into any mischief, Jamie(who we call our red boy lol)is an angel & a gentleman & appreciates some time out from his little(well not so little now)playmate if they are left alone
I have a load of crates of various sizes from Cavalier to GSD, soft ones & wire ones. I feed Jessie in a crate to ensure she doesn't swop food with Rjj. Rjj likes the Cavaliers soft crate that is big enough for two/three Cavaliers or one BC who likes a snug fitting bed !
I do close the door on puppies during the night. It can also be used during human meal times so that the puppy never learns to ask for food from the table(one of my pet hates)
Toilet training, well it does stop the puppy going indoors outside of the crate when the door is shut. I prefer to take the puppy out every couple of hours, when it wakes up, after feeding & anytime it looks as if it wants to go. My Wukee will be interesting to train as my furkids now have their own door so I don't have to either have the door open all day or keep opening the kitchen door to let them out when they ask. I'm opening a book on how long it will take him to learn & be able to use the new door(took the older BC's a whole day LOLOL
The drawbacks are if it is used as a punishment for unacceptable behaviour & used for very long periods of time.
I close the crate on a night